Perhaps you should try some spelling variations:
hermann book » german book, hermann broch, hermann lohr
gail robert » gal robert, hall robert, ball robert
robert j » robert _, robert e
_ robust » _ robert
robust e » robust _, robust a, robust end
heilmann » heilemann, heimann, heitmann
ebooks » books, ebook, redbooks

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: (( gail robert j. hermann book ) or ( _ robust e. heilmann ebooks ))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (( gail robert j. hermann book ) OR ( _ robust e. heilmann ebooks )).
• Adding a wildcard symbol may retrieve word variants: (( gail robert j. hermann book ) or ( _ robust e. heilmann ebooks ))*.